The SEM image is a soda-lime glass bead (around 60 micron diameter) which was exposed to 1M NaOH for 2 weeks. Dissolved glass precipitates as a calcium silicate hydrate crystal, close to Tobermorite in structure.
The issue will be coming out if few weeks.
This is a great accomplishment to be on the front cover of ACerS! Congrats Hamed!